package com.asyf.shoporder.controller;

import com.alibaba.fastjson.JSON;
import com.asyf.shopcommon.Order;
import com.asyf.shopcommon.Product;
import com.asyf.shoporder.service.OrderService;
import com.asyf.shoporder.service.ProductService;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.cloud.client.ServiceInstance;
import org.springframework.cloud.client.discovery.DiscoveryClient;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.client.RestTemplate;

import java.util.List;
import java.util.Random;

/**
 * @Author yjz
 * @Date 2022/8/31 22:03
 */
@RestController
@Slf4j
public class OrderController {

    @Autowired
    private RestTemplate restTemplate;
    @Autowired
    private OrderService orderService;

    @Autowired
    private DiscoveryClient discoveryClient;

    @Autowired
    private ProductService productService;

    //准备买1件商品 http://localhost:8092/order/prod/1
    @GetMapping("/order/prod/{pid}")
    public Order order(@PathVariable("pid") Integer pid) {
        log.info(">>客户下单，这时候要调用商品微服务查询商品信息");
        //通过restTemplate调用商品微服务
        Product product = restTemplate.getForObject("http://localhost:8081/product/" + pid, Product.class);
        Order order = new Order();
        order.setUid(1);
        order.setUsername("测试用户");
        order.setPid(product.getPid());
        orderService.save(order);

        return order;
    }

    //从nacos中获取服务地址
    //准备买1件商品 http://localhost:8092/order2/prod/1
    @GetMapping("/order2/prod/{pid}")
    public Order order2(@PathVariable("pid") Integer pid) {
        log.info(">>客户下单，这时候要调用商品微服务查询商品信息");
        //从nacos中获取服务地址
        ServiceInstance serviceInstance = discoveryClient.getInstances("service-product").get(0);
        String url = serviceInstance.getHost() + ":" + serviceInstance.getPort();
        log.info(">>从nacos中获取到的微服务地址为:" + url);

        //通过restTemplate调用商品微服务
        Product product = restTemplate.getForObject("http://" + url + "/product/" + pid, Product.class);
        Order order = new Order();
        order.setUid(1);
        order.setUsername("测试用户");
        order.setPid(product.getPid());
        orderService.save(order);

        return order;
    }

    //自定义负载均衡
    //准备买1件商品 http://localhost:8092/order3/prod/1
    @GetMapping("/order3/prod/{pid}")
    public Order order3(@PathVariable("pid") Integer pid) {
        log.info(">>客户下单，这时候要调用商品微服务查询商品信息");
        //从nacos中获取服务地址
        List<ServiceInstance> instances = discoveryClient.getInstances("service-product");

        //负载均衡
        int i = new Random().nextInt(instances.size());
        ServiceInstance serviceInstance = instances.get(i);
        String url = serviceInstance.getHost() + ":" + serviceInstance.getPort();
        log.info(">>从nacos中获取到的微服务地址为:" + url);

        //通过restTemplate调用商品微服务
        Product product = restTemplate.getForObject("http://" + url + "/product/" + pid, Product.class);
        Order order = new Order();
        order.setUid(1);
        order.setUsername("测试用户");
        order.setPid(product.getPid());
        order.setPname(product.getPname());
        order.setPprice(product.getPprice());
        order.setNumber(1);
        orderService.save(order);
        return order;
    }

    //Ribbon 在RestTemplate 的生成方法上添加@LoadBalanced注解
    //准备买1件商品 http://localhost:8092/order4/prod/1
    @GetMapping("/order4/prod/{pid}")
    public Order order4(@PathVariable("pid") Integer pid) {
        log.info(">>客户下单，这时候要调用商品微服务查询商品信息");
        //直接使用微服务名字， 从nacos中获取服务地址
        String url = "service-product";
        log.info(">>从nacos中获取到的微服务地址为:" + url);

        //通过restTemplate调用商品微服务
        Product product = restTemplate.getForObject("http://" + url + "/product/" + pid, Product.class);
        Order order = new Order();
        order.setUid(1);
        order.setUsername("测试用户");
        order.setPid(product.getPid());
        order.setPname(product.getPname());
        order.setPprice(product.getPprice());
        order.setNumber(1);
        orderService.save(order);
        return order;
    }

    //Ribbon 在RestTemplate 的生成方法上添加@LoadBalanced注解
    //准备买1件商品 http://localhost:8092/order5/prod/1
    @GetMapping("/order5/prod/{pid}")
    public Order order5(@PathVariable("pid") Integer pid) {
        log.info(">>客户下单，这时候要调用商品微服务查询商品信息");
        //直接使用微服务名字， 从nacos中获取服务地址

        //通过fegin调用商品微服务
        Product product = productService.findByPid(pid);
        log.info(">>商品信息,查询结果:" + JSON.toJSONString(product));

        Order order = new Order();
        order.setUid(1);
        order.setUsername("测试用户");
        order.setPid(product.getPid());
        order.setPname(product.getPname());
        order.setPprice(product.getPprice());
        order.setNumber(1);
        orderService.save(order);
        return order;
    }

    //http://localhost:8092/order6/prod/1
    //4.1高并发带来的问题
    @GetMapping("/order6/prod/{pid}")
    public Order order6(@PathVariable("pid") Integer pid) {
        log.info(">>客户下单，这时候要调用商品微服务查询商品信息");
        //直接使用微服务名字， 从nacos中获取服务地址

        //通过fegin调用商品微服务
        Product product = productService.findByPid(pid);
        log.info(">>商品信息,查询结果:" + JSON.toJSONString(product));

        //模拟一次网络延时
        try {
            Thread.sleep(1000);
        } catch (InterruptedException e) {
            e.printStackTrace();
        }

        Order order = new Order();
        order.setUid(1);
        order.setUsername("测试用户");
        order.setPid(product.getPid());
        order.setPname(product.getPname());
        order.setPprice(product.getPprice());
        order.setNumber(1);
        orderService.save(order);
        return order;
    }

    //http://localhost:8092/order/message
    @RequestMapping("/order/message")
    public String message() {
        return "高并发下的问题测试";
    }

}
